A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 522
and breaker.These impulses are sent into the line by the de-pression of keys on a suitably arranged key-board. When the proper letter or v.v?z.era\ is reachedat the receiving end, the printing wheel isstopped, and a paper fillet is pressed against itssurface. The printing wheel is kept coveredwith… … Fig. S32. Callahans Printing Telegraph. A system Telegraphy, Quadruplex — for the simultaneous transmission of four mes-sages over a single wire, two in one directionand the remaining two in the opposite direc-tion. Quadruplex telegraphy consists in fact of du-plex telegraphy duplexed. There are…
Electricity · Electrical engineering
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